What is Curie temperature: Definition and 11 Discussions

In physics and materials science, the Curie temperature (TC), or Curie point, is the temperature above which certain materials lose their permanent magnetic properties, which can (in most cases) be replaced by induced magnetism. The Curie temperature is named after Pierre Curie, who showed that magnetism was lost at a critical temperature.The force of magnetism is determined by the magnetic moment, a dipole moment within an atom which originates from the angular momentum and spin of electrons. Materials have different structures of intrinsic magnetic moments that depend on temperature; the Curie temperature is the critical point at which a material's intrinsic magnetic moments change direction.
Permanent magnetism is caused by the alignment of magnetic moments and induced magnetism is created when disordered magnetic moments are forced to align in an applied magnetic field. For example, the ordered magnetic moments (ferromagnetic, Figure 1) change and become disordered (paramagnetic, Figure 2) at the Curie temperature. Higher temperatures make magnets weaker, as spontaneous magnetism only occurs below the Curie temperature. Magnetic susceptibility above the Curie temperature can be calculated from the Curie–Weiss law, which is derived from Curie's law.
In analogy to ferromagnetic and paramagnetic materials, the Curie temperature can also be used to describe the phase transition between ferroelectricity and paraelectricity. In this context, the order parameter is the electric polarization that goes from a finite value to zero when the temperature is increased above the Curie temperature.

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  1. K

    I Questions about Curie Temperature Characteristics

    Is the curie temperature of a ferromagnetic material constant? Are there any factors that will raise it or lower it? For instance, what happens if my piece of iron is already in a strong magnetic field? Is the curie temperate higher, then?
  2. Sveral

    Cutting magnets without losing magnetization (Curie temperature issue)

    Hello, I wanted to know, if someone knows of a realistic option of, how to cut barrium ferrite magnets without using a rock saw and without demagnetizing the magnet obviously? Thanks in advance everyone.
  3. J

    Can a demagnetized neodymium magnet be restored?

    Can a Neodymium magnet get back it's magnetic properties after being demangnetized? Say that there is a Neodymium magnet(Nd-Fe-B) that has been demagnetized(turned paramagnetic) at a temperature higher than its curie temperature. If I extract the demagnetized Neodymium(Nd) from the...
  4. U

    Curie-Weiss Paramagnetism susceptibility

    Homework Statement (a) Show the curie-weiss behaviour. (b) Estimate ##\lambda## and ##B_e## and exchange energy.[/B] Homework EquationsThe Attempt at a Solution Part(a) Since even when applied field is zero, ##B_{total} \neq 0## which gives rise to ##M\neq 0##. This is a fundamental...
  5. U

    Magnetic Susceptibility and Curie Temperature

    Homework Statement Part(a): Derive susceptibility Part(b): Find field experienced by neighbour. Part(c): State temperature range. What explains temperature dependence beyond curie temperature? Why is curie temperature so high? Part(d): In practice, measured magnetic moment is far lower than...
  6. J

    Importance of knowing the Curie temperature?

    For a module I recently ran a computer simulation to determine the temperature at which a material underwent a ferromagnetic to paramagnetic phase transition. However, I'm not really sure what the applications are of knowing this are. Obviously if you wanted the material to retain its permanent...
  7. C

    Statistical Mechanics Mean Field Model

    I don't think I've fully grasped the underlying ideas of this class, so at the moment I'm just sort of flailing for equations to plug stuff into... Homework Statement Show that in the mean field model, M is proportional to H1/3 at T=Tc and that at H=0, M is proportional to (Tc - T)1/2...
  8. O

    Curie temperature, reversible process

    Hello guys, first post in this forum :) Magnetism has always been complicated to understand for me, and I would like some help regarding Curie temperatures. We have just bought a new measurement equipment to out lab which shall be temperature calibrated with curiepoints. We have three...
  9. J

    Magnetization above Curie Temperature

    Hi all, I'm preparing a talk about Curie Temperature, and looking for some Ms(T) graphs in the web I've found some of them in which the magnetization is not zero when T > Tc, (the dramatic change is obversable, so it is the Tc). But for T > Tc I expect complete disorder and no domains, then...
  10. D

    Curie Temperature: Determining Critical Point & Lattice Changes

    I was wondering how to we determine the Curie Temperature of a ferromagnet? I know an experiment can give us the critical point, but what about the changes in the lattice of each substance changes curie temperature? I do know it depends on the coordination number(number of neighbors). My teacher...
  11. I

    Where Can I Find Matt Mcmohan's Labview Program on Measuring Curie Temperature?

    Anyone has Matt Mcmohan's Labview program on measuring curie temparature. I here its free . but i cannot find it on the net